id:A129345 - OEIS Search Results

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a(2n) = A001542(n+1), a(2n+1) = A038761(n+1); a Pellian-related sequence.

+0
2

2, 9, 12, 53, 70, 309, 408, 1801, 2378, 10497, 13860, 61181, 80782, 356589, 470832, 2078353, 2744210, 12113529, 15994428, 70602821, 93222358, 411503397, 543339720, 2398417561, 3166815962, 13979001969, 18457556052, 81475594253 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`Summation with of -a(n) and A129346 returns twice Pell numbers A000129 (apart from signs; starting from 2nd term of A000129)`
	FORMULA	`Generating function (2+9x-x^3)/((x^2+2x-1)(x^2-2x-1)).`
	CROSSREFS	`Cf. A129346, A000129, A001542, A038761.` `Sequence in context: A126977 A102237 A076505 this_sequence A125019 A024976 A068047` `Adjacent sequences: A129342 A129343 A129344 this_sequence A129346 A129347 A129348`
	KEYWORD	`easy,nonn`
	AUTHOR	`Creighton Dement (creighton.k.dement(AT)uni-oldenburg.de), Apr 10 2007`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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